Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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  • Shigehiro Yasui
    Type: Researches
    2018 Volume 73 Issue 11 Pages 771-775
    Published: November 05, 2018
    Released: May 24, 2019
    JOURNALS RESTRICTED ACCESS

    We study the Kondo effect in nuclear matter or in quark matter, where a heavy hadron or a heavy quark is embedded as an impurity particle at low temperature. We show that the effective coupling constants become enhanced at low energy scale (the Kondo scale), and present that the Kondo effect induces interesting non-perturbative phenomena.

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  • Taketomo Nakamura, Shingo Katsumoto
    Type: Researches
    2018 Volume 73 Issue 11 Pages 776-781
    Published: November 05, 2018
    Released: May 24, 2019
    JOURNALS RESTRICTED ACCESS

    Progress in semiconductor nano-fabrication technique has enabled us to observe in solids not only elementary quantum mechanical phenomena like the Aharonov-Bohm effect or the quantum tunneling effect, but also undiscovered particles or phenomena in particle physics. As a matter of practice, it is impossible to observe the trembling motion of relativistic electrons, which phenomenon called Zitterbewegung (ZB). However, the observation of ZB as a solid-state phenomenon has been seriously considered. Various types of ZB have been predicted, one of which is the meandering motion of electrons in quantum wells with the Rashba-type spin-orbit interaction. In the present study, we have observed ZB in an InAs quantum well as a conductance fluctuation in a spin-polarized semi-ballistic transport provided by quantum point contact electrodes.

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  • Kazuya U. Kobayashi, Rei Kurita
    Type: Researches
    2018 Volume 73 Issue 11 Pages 782-787
    Published: November 05, 2018
    Released: May 24, 2019
    JOURNALS RESTRICTED ACCESS

    We experimentally investigate the convection dynamics using several different fluids and find that transient stagnant domain is formed during thermal convection in well-mixed two component fluids. In addition, we find that difference in viscosity between the two components is one of the most important factors for the formation of transient stagnant domain. We conclude that the dynamical asymmetry plays an important role in the thermal convection with two-component fluid mixture.

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